Revert of Web Notifications should always reappear as popups when updated.

Revert of Web Notifications should always reappear as popups when updated. (https://codereview.chromium.org/301713002/)

Reason for revert:
Causes Linux ASAN errors.

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%283%29/builds/5914/steps/interactive_ui_tests/logs/TestNotificationReplacement

Original issue's description:
> Web Notifications should always reappear as popups when updated.
> 
> The message center already does this for notifications with a higher
> priority than the notification they replace, but this makes it explicit
> for Web Notifications (which cannot indicate priority).
> 
> This patch re-enables the NotificationTest.TestNotificationReplacement
> test, which was marked as DISABLED because of LSan failures.
> 
> BUG=366102, 366539
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=286831


TBR=dewittj, peter
NOTREECHECKS=true
NOTRY=true
BUG=366102, 366539
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=286877

[erikchen, 2014-07-31 19:46:16]

Created Revert of Web Notifications should always reappear as popups when
updated.

[Peter Beverloo, 2014-07-31 19:47:34]

Oh no, sorry for the trouble!

lgtm (you'll still need to TBR OWNERS).

[commit-bot: I haz the power, 2014-07-31 19:48:10]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/417163005/1

[erikchen, 2014-07-31 19:48:48]

The CQ bit was unchecked by erikchen@chromium.org

[erikchen, 2014-07-31 19:48:53]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-07-31 19:52:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/417163005/1

[commit-bot: I haz the power, 2014-07-31 20:01:25]

Change committed as 286877